Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;

public class Main {
    public static void main(String[] args) throws Exception {
        RandomAccessFile f = new RandomAccessFile("hello.txt", "rw");
        FileChannel fc = f.getChannel();
        MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_WRITE, 0, f.length());

        int len = (int) f.length();
        for (int i = 0, j = len - 1; i < j; i++, j--) {
            byte b = mbb.get(i);
            mbb.put(i, mbb.get(j));
            mbb.put(j, b);
        }
        fc.close();
    }
}